#include <stdio.h>
#include <assert.h>
char* my_strcpy(char* dest, const char* str)
{
	assert(dest && str);
	char* ret = dest;
		while (*dest++ = *str++)
		{
			;
		}
		return ret;
}
int main()
{
	char arr1[20];
	char arr2[] = "hello,world";
	my_strcpy(arr1, arr2);
	printf("%s", arr1);
	return 0;
}